16
INTER 2V4SA, rev.02
INTER 2V4SA
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3: stage
3 fans start running.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3 & 4:
stage 4 fans start.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3, 4 &
5: stage 5 fans start.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3, 4 &
5 & 6: stage 6 fans start.
If the room temp. falls:
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3, 4 &
5: stage 6 fans return to a stop.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3 & 4:
stage 5 fans return to a stop.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2 + Differential 3: stage
4 fans return to a stop.
• At Set Point + Bandwidth 1 + Stage 2
Bandwidth 2: stage 3 fans return
to a stop; stage 2 fans start decreasing in
speed as the T° decreases.
• At Set Point + Bandwidth 1 + Stage 2
Offset - 0,2°C (0,4°F): Stage 2 fans return
to a stop.
• At Set Point + Bandwidth 1: Stage 1 fans
start decreasing in speed as the temperature
decreases.
•
At Set Point:
Stage 1 fans reach minimum
speed.
•
0,2°C (0,4°F) Below the Set Point
: Stage 1
fans stop operating continuously and operate
according to the minimum ventilation cycle
at min speed.
25
INTER 2V4SA, rev.02
INTER 2V4SA
I. Specifying Ramp Steps
Ramp steps can only be modified while the
ramp is disabled (see section iv. to disable
the ramp).
• Select the
STAGE 1 MIN SPEED / RAMP-
menu. The current temperature set point
flashes on the display – the value does not
flash if the ramp is enabled.
Repeat the following steps for each ramp
step (steps 0-9).
• Press the Other Functions button. The
day number of the first ramp step (step 0)
is displayed "
d0 x
" ("x" is the day number).
• Use the adjustment buttons to set the day
number of the first ramp step.
• Press the Other Functions button once
again. The minimum ventilation speed associ-
ated with the first step of the ramp (step 0) is
displayed alternating with letters
"P0 x"
("x"
represents the speed). Adjust the minimum
speed with the adjustment buttons
• Press the Other Functions button again to
select the following ramp step.
• Proceed in similar fashion to set all ramp
steps and then, enable the ramp as explained
below.
II. Activating the Min. Ventilation
Speed Ramp
• If you have just finished specifying ramp
steps, press the Other Functions button
once again. The word
OFF
flashes on the
display.
• Press the up-arrow adjustment button.
The word
ON
flashes on the display and the
Minimum Speed Ramp Status LED flashes,
indicating that the minimum speed ramp is
now activated.
or
• If you have previously defined ramp steps,
select the
STAGE 1 MIN SPEED/RAMP menu
and then press the Other Functions button
to scroll down all ramp steps, until the word
OFF
appears (twenty-one clicks).
• Press the up-arrow adjustment button.
The word
ON
flashes on the display and
the Min Speed Ramp status LED flashes,
indicating that the minimum speed ramp is
now activated.
III. Adjusting the Day Number
The day number can be adjusted in order
to move forward or backward on the ramps
(temperature and min. ventilation ramp).
• Select the
CURRENT RAMPING DAY
menu.
The current day number is displayed, alternat-
ing with the letters "
day
".
• Use the adjustment buttons to set it to the
desired value.
IV. Deactivating the Minimum Ven-
tilation Speed Ramp
• Select the
STAGE 1 MIN SPEED/RAMP
menu and then press the Other Functions
button to scroll down all ramp steps, until the
word
ON
appears (twenty-one clicks).
• Press the down-arrow adjustment button
once. The word
OFF
flashes on the display
and the Min Speed Ramp status LED turns
off.
